ET went into administration in June after failure to find a replacement for parent Emblaze, who decided to reduce its share.
ET hoped to finalise court proceedings by September. If the VAT was reclaimed, ET would be able to repay its £8 million debt to creditors Nico Dervisaj, Emblaze, Samsung, Brightstar, i-mate and 20:20.
Former financial director Jim Mann said: “The receivers need more information. It’s never ending.”